<template>
  <div ref="terminal" id="terminal"></div>
</template>

<script>

import {defineComponent, onMounted, ref, onUnmounted} from 'vue'
import { useRouter } from 'vue-router'
import { Terminal } from 'xterm';
import { FitAddon  } from 'xterm-addon-fit';
import 'xterm/css/xterm.css'
import { ElMessage } from 'element-plus'

export default defineComponent({
  name: 'Xterm',
  setup(){
    //实例化路由
    const shellWs = ref(null)
    const rows = ref(null)
    const cols = ref(null)

    const term = new Terminal({
      rendererType: 'canvas',
      cursorBlink: true,
      convertEol: true,
      scrollback: 800,
      row: 70,
      theme: {
        foreground: 'white',
        background: '#181E29'
      }
    })
    const fitAddon = new FitAddon();
    // canvas背景全屏
    term.loadAddon(fitAddon);
    fitAddon.fit();
    const router = useRouter();
    const podName = router.currentRoute.value.query.podName
    const podNamespace = router.currentRoute.value.query.podNamespace
    const containerName = router.currentRoute.value.query.containerName
    const SHELL = router.currentRoute.value.query.shell
    const querystring = "ws://kube-web-service:8080/resource/websocket?" + "podNs="+ podNamespace + "&podName=" + podName + "&containerName=" + containerName + "&shell=" + SHELL
    const ws = new WebSocket(querystring)
    onMounted(()=>{
      term.open(document.getElementById('terminal'));  //绑定dom节点
      term.focus() // 取得输入焦点
      term.writeln('Connecting...');  // 写一行测试
      ws.onclose = function (e) {
        ElMessage.warning({
          message: '链接已关闭',
          type: 'warning',
          center: true,
        });
      }
      ws.onmessage = function (e) { // 服务端ssh输出, 写到web shell展示
        term.write(e.data)
      }
      ws.onerror = function (e) {
        ElMessage.error({
          message: '请更换，shell环境再试一下',
          type: 'error',
          center: true,
        });
      }
      // 当浏览器窗口变化时, 重新适配终端
      window.addEventListener("resize", function () {
        fitAddon.fit();
        // 把web终端的尺寸term.rows和term.cols发给服务端, 通知sshd调整输出宽度
        var msg = {type: "resize", rows: term.rows, cols: term.cols}
        ws.send(JSON.stringify(msg))
      })
      // 当向web终端敲入字符时候的回调
      // term.onKey(e => {  //给后端发送数据
      //   // 写给服务端, 由服务端发给container
      //   console.log(e.key)
      //   var msg = {type: "input", input: e.key }
      //   ws.send(JSON.stringify(msg))
      // })
      // 支持输入与粘贴方法
      term.onData(function(input) {
        // 写给服务端, 由服务端发给container
        var msg = {type: "input", input: input}
        ws.send(JSON.stringify(msg))
      })
    })
    onUnmounted(()=>{
      ws.close()
    })
    return {
      shellWs, term, rows, cols
    }
  },
})
</script>

<style>

</style>
